Mobster or mental case? That's the question at the heart of FBI agents Mike Tozzi and Cuthbert Gibbons's latest case. Sal Immordino, incarcerated in a psychiatric institution, is actually plotting his comeback with the help of his sister (the nun) and a serial-killer-in-training. Bodies are piling up-and Gibbons and Tozzi have to throw out the rule book to keep Immordino off the throne . . . .